// 前端 User WebSocket SDK（浏览器使用原生 WebSocket，Node 测试需注入 global.WebSocket）
// 消息类型定义
export type UserUpdateType = 'order_update' | 'position_update' | 'balance_update' | 'welcome';

export interface UserMsg {
    type: UserUpdateType;
    data?: any;
    msg?: string; // mainly for welcome
    timestamp?: number;
    t?: number; // for welcome timestamp
}

// 订单数据结构 (对应后端 ClobOrder)
export interface OrderData {
    ID: number;
    userID: number;
    market: string;
    status: number;
    assetID: string;
    side: number;
    price: number;
    originalSize: number;
    sizeMatched: number;
    outcome: string;
    expiration: number;
    orderType: number;
    feeRateBps: number;
    CreatedAt?: string;
    UpdatedAt?: string;
}

// 持仓数据结构 (对应后端 ClobPosition)
export interface PositionData {
    ID: number;
    userID: number;
    marketID: string;
    tokenId: string;
    side: number;
    size: number;
    available: number;
}

// 余额数据结构 (对应后端 PmTokenBalance)
export interface BalanceData {
    ID: string;
    userID: number;
    amount: string;
    available: string;
    frozen: string;
    tokenType: string;
    token_id: string; // 注意后端字段可能是不一致的，这里根据 Go 结构体推测，或者是 json tag
    market_id: string;
    wallet_address: string;
}

// SDK 配置选项
export interface UserSocketOptions {
    url?: string;
    token: string; // 必须提供 Token
    autoReconnect?: boolean;
    reconnectInterval?: number;
    maxReconnectAttempts?: number;
}

// 回调函数类型（兼容浏览器 Event/CloseEvent）
export type ConnectCallback = (event: Event) => void;
export type DisconnectCallback = (event: CloseEvent) => void;
export type ErrorCallback = (event: Event) => void;
export type WelcomeCallback = (msg: UserMsg) => void;
export type OrderCallback = (data: OrderData) => void;
export type PositionCallback = (data: PositionData) => void;
export type BalanceCallback = (data: BalanceData) => void;

export class UserSdk {
    private url: string;
    private token: string;
    private ws: InstanceType<typeof WebSocket> | null = null;
    private autoReconnect: boolean;
    private reconnectInterval: number;
    private maxReconnectAttempts: number;
    private reconnectAttempts = 0;
    private isExplicitClose = false;

    private listeners = {
        connect: [] as ConnectCallback[],
        disconnect: [] as DisconnectCallback[],
        error: [] as ErrorCallback[],
        welcome: [] as WelcomeCallback[],
        order: [] as OrderCallback[],
        position: [] as PositionCallback[],
        balance: [] as BalanceCallback[]
    };

    constructor(options: UserSocketOptions) {
        this.token = options.token;
        this.autoReconnect = options.autoReconnect ?? true;
        this.reconnectInterval = options.reconnectInterval ?? 3000;
        this.maxReconnectAttempts = options.maxReconnectAttempts ?? 5;

        // 构造 URL
        let baseUrl = options.url || "ws://localhost:8888/clob/ws/user";
        if (baseUrl.startsWith("/")) {
            // 如果是相对路径 (浏览器环境)，自动补充 host
            if (typeof window !== 'undefined' && window.location) {
                const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
                baseUrl = `${protocol}//${window.location.host}${baseUrl}`;
            } else {
                baseUrl = "ws://localhost:8888" + baseUrl;
            }
        }
        
        // 拼接 Token
        const separator = baseUrl.includes('?') ? '&' : '?';
        this.url = `${baseUrl}${separator}token=${this.token}`;
    }

    // 连接
    public connect() {
        if (this.ws) {
            console.warn("UserSdk: WebSocket already connected or connecting");
            return;
        }

        try {
            console.log(`UserSdk: Connecting to ${this.url}...`);
            this.ws = new WebSocket(this.url);

            this.ws.onopen = (event: Event) => {
                console.log("UserSdk: Connected");
                this.reconnectAttempts = 0;
                this.listeners.connect.forEach(cb => cb(event));
            };

            this.ws.onclose = (event: CloseEvent) => {
                console.log(`UserSdk: Disconnected (Code: ${event.code})`);
                this.ws = null;
                this.listeners.disconnect.forEach(cb => cb(event));

                if (this.autoReconnect && !this.isExplicitClose) {
                    this.handleReconnect();
                }
            };

            this.ws.onerror = (event: Event) => {
                console.error("UserSdk: Error", event);
                this.listeners.error.forEach(cb => cb(event));
            };

            this.ws.onmessage = (event: MessageEvent) => {
                try {
                    const raw = typeof event.data === 'string' ? event.data : String(event.data);
                    const msg = JSON.parse(raw) as UserMsg;
                    this.handleMessage(msg);
                } catch (e) {
                    console.error("UserSdk: Failed to parse message", event.data);
                }
            };

        } catch (e) {
            console.error("UserSdk: Connection failed", e);
            if (this.autoReconnect) this.handleReconnect();
        }
    }

    // 断开连接
    public disconnect() {
        this.isExplicitClose = true;
        if (this.ws) {
            this.ws.close();
            this.ws = null;
        }
    }

    // 消息分发
    private handleMessage(msg: UserMsg) {
        switch (msg.type) {
            case 'welcome':
                this.listeners.welcome.forEach(cb => cb(msg));
                break;
            case 'order_update':
                this.listeners.order.forEach(cb => cb(msg.data));
                break;
            case 'position_update':
                this.listeners.position.forEach(cb => cb(msg.data));
                break;
            case 'balance_update':
                this.listeners.balance.forEach(cb => cb(msg.data));
                break;
            default:
                console.warn("UserSdk: Unknown message type", msg);
        }
    }

    // 重连逻辑
    private handleReconnect() {
        if (this.reconnectAttempts >= this.maxReconnectAttempts) {
            console.error("UserSdk: Max reconnect attempts reached");
            return;
        }

        this.reconnectAttempts++;
        console.log(`UserSdk: Reconnecting in ${this.reconnectInterval}ms (Attempt ${this.reconnectAttempts})...`);
        setTimeout(() => {
            this.connect();
        }, this.reconnectInterval);
    }

    // 事件注册方法
    public onConnect(cb: ConnectCallback) { this.listeners.connect.push(cb); }
    public onDisconnect(cb: DisconnectCallback) { this.listeners.disconnect.push(cb); }
    public onError(cb: ErrorCallback) { this.listeners.error.push(cb); }
    public onWelcome(cb: WelcomeCallback) { this.listeners.welcome.push(cb); }
    public onOrderUpdate(cb: OrderCallback) { this.listeners.order.push(cb); }
    public onPositionUpdate(cb: PositionCallback) { this.listeners.position.push(cb); }
    public onBalanceUpdate(cb: BalanceCallback) { this.listeners.balance.push(cb); }
}